Oct24_1_Jingya

Includes: Welcome screen, main menu, help menu

Since the assignment requirement says not to claim to have any features
that do not currently work, I didn't add all the features (as the
prototype did) to the menus.
And I don't have appropriate images for icons at the moment so I just
used casual ones. Anyway we can replace them later.
Merge pull request #1 from lenauelle/master

Oct24_1_Jingya